What may be the consequence of insufficient air pressure in the tyres?

In the photo, there is the front wheel of a motorcycle with a tyre, a brake disc and a mudguard. The result of tyre pressure that is too low is poorer grip of the tyre on the road surface - answer C.

The Road Traffic Act requires a vehicle to be maintained in such a way that it does not endanger safety, and the Regulation on the technical conditions of vehicles requires the tyre pressure to match the manufacturer's recommendations for the given tyre and the load of the vehicle. A tyre with pressure that is too low deforms, its sides flex on bends, and the tread does not sit evenly on the road; the tyre heats up, "floats" and loses grip, especially in the wet. The motorcycle handles heavily, turns into a bend with a delay and wobbles on a straight road - so answer A is the opposite of the truth. Pressure that is too low also shortens the life of the tyre (answer B is wrong): the sides crack, and the tread wears unevenly at the edges. You check the pressure on cold tyres every week and before a longer trip, using the values from the manual or from the sticker on the swingarm; with a passenger and luggage, the manufacturer usually tells you to increase the pressure in the rear tyre.

Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym); § 11 para. 5 of the Regulation on the technical conditions of vehicles and the scope of their necessary equipment